About the Column Configuration dialog

Inventory attributes: Lists each of the inventory objects and attributes
scanned into the core database. Expand or collapse objects by clicking the box
to the left of the object.

Add to columns: Moves the selected inventory attribute into the columns
list. If you select an entire inventory component, all of the inventory attributes
contained in that component are added to the columns list.

Columns: Lists the inventory attributes in the order they will appear,
from left to right, in the Network View.